Pencil-sharpener.



No. 857,574. `PATBII'IED` JUNE 25, 1907.

F, E. V. BAINES.'

'PENGIL SHARPBNBR.` APLICATION FILED 00T. 4. 1906.

WITNSSES: y 'l NvENToFg. a? Z277 Mr/wy. l

UNITED STATES PATENT OFFICE.

PENCIL-SHARPENER.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed October 4, 1906. Serial No. 337,432.

T0 @ZZ whom t may concern:

Be it known that I, FREDERICK EDWARD VEsEY BAINEs, a subject of the King of Great Britain and Ireland, residing at 2 Orchard road, Blackheath, in the county of Kent, England', have invented a new and useful Improvement in Pencil Sharpeners, of which the following is a specification.

This invention relates to improvements in that type of pencil sharpener forming the subject-matter of application for Letters Patent No. 302,746, applied for by me on the 24th day of February 1906, and it has for its object, so constructing the cutter for putting a point on the graphite or lead of a pencil that it will produce an even round point.

In the accompanying drawing which illustrates this invention :-Figures l, 2 and 3 are views in end elevation and side elevations respectively showing the impro ved cutter for cutting the lead or graphite, Figs. 4, 5, 6 and 7 are views in end and side elevations respectively showing an alternative form of cutter for cutting the lead or graphite, and Figs. 8 and 9 are views in end and side elevations respectively of the cutter in progress of construction.

Throughout the views similar parts are marked with like letters of reference.

The object of the present invention is to produce an even round point on the graphite of the pencil because if the said point is of an irregular shape in cross section it is extremely liable to break in use and so unnecessarily waste the pencil.

According to the present invention the cutter employed for pointing the graphite is of that type which consists of a metallic bush with internal radial conically arranged cutting edges formed by radially slotting said bush with V-shaped slots. These cutters as at present constructed invariably have these V-shaped slots of equal width. Now it has been found in practice that unless the graphite of the pencil is itself truly circular in cross-section there is an opportunity for the graphite to wabble between the equallyspaced cutting edges during the rotation of the pencil with the result that the graphite point thereby produced is poly-sided or of an irregular shape in cross-section. In order to overcome this difliculty and produce an even round point I make the V-shaped slots of varying widths so that the cutting edges are at unequal distances from each other or from the aXis. In Figs. 1, 2 & 3 which represent a cutter having four cutting edges formed by four radially arranged slots d d d1 d1, the two oppositely arranged slots d d are of a greater width than the other slots d1 d1 so that the cutting edges so produced are at unequal distances from each other. In Figs. 4, 5, 6 & 7 the two oppositely arranged slots d d are of one width, the slot d1 is of a less width, and

l the opposite slot d1 is of still less width, so

producing cutting edges also situated at unequal distances from one another. With a cutter so constructed a point is produced on the graphite which is invariably truly circular 1n cross-section irrespective of its original cross-section.

convenient method of making these cutters is to turn them in the form of pins or studs, to saw cut them, as shown in Figs. 8 and 9, and then open the saw cuts out by means of a suitable wedge-shaped tool.

What I claim as my invention, and desire to secure by Letters Patent is z l. In a pencil Sharpener, a cutter for sharpening the lead or graphite consisting of a metallic bush having a plurality of radially arranged V-shaped slots of varying widths, as set forth.

2. In a pencil Sharpener a cutter for sharpening the lead or graphite consisting of a metallic bush having four radially arranged slots two of which are of the same width and the other two slots are each of a different width, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FREDERICK EDWARD VESEY BAINES.

Witnesses:

G. V. SYMEs, H. D. JAMESON. 

